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Ideally, I think you would address both in q2 as well. I think you could achieve that by expressing an interest in the kind of work commercial lawyers do in an international law firm, rather than the work that they would do in a national one. Presumably, this will be an interest in complex cross-border transactions, cases, or advisory matters for clients with businesses in many jurisdictions. The challenge of understanding the legal and commercial implications in many foreign countries could be one that is appealing to you. Similarly, the types of clients you would get to work for - multinational corporations, huge financial institutions, and sophisticated investors - could once again be attractive for various reasons. The point is that if your interest in working at an international firm has to do with the particular type of commercial law work that entails, your motivation will answer both parts simultaneously.If, however, your motivations for wanting to work for an international law firm are not very commercial-law related (say, if it has to do with wanting to get exposure to different legal systems - something you would get if you were working at an international law firm even if it specializes in something like family law), I think you should address the commercial law point specifically as well. If you feel you have adequately addressed it already in the cover letter you do not need to elaborate a lot. It should be fine to build on some of the conclusions you have reached in the cover letter and move on to motivate the international firm element more quickly.
Ideally, I think you would address both in q2 as well. I think you could achieve that by expressing an interest in the kind of work commercial lawyers do in an international law firm, rather than the work that they would do in a national one. Presumably, this will be an interest in complex cross-border transactions, cases, or advisory matters for clients with businesses in many jurisdictions. The challenge of understanding the legal and commercial implications in many foreign countries could be one that is appealing to you. Similarly, the types of clients you would get to work for - multinational corporations, huge financial institutions, and sophisticated investors - could once again be attractive for various reasons. The point is that if your interest in working at an international firm has to do with the particular type of commercial law work that entails, your motivation will answer both parts simultaneously.
If, however, your motivations for wanting to work for an international law firm are not very commercial-law related (say, if it has to do with wanting to get exposure to different legal systems - something you would get if you were working at an international law firm even if it specializes in something like family law), I think you should address the commercial law point specifically as well. If you feel you have adequately addressed it already in the cover letter you do not need to elaborate a lot. It should be fine to build on some of the conclusions you have reached in the cover letter and move on to motivate the international firm element more quickly.