What perspective can you bring to the company? What can you add that they don't already have, or what other candidates don't have? It's a tricky question but also one of the more important ones. Nailing that question down gives you a direction to steer the conversation to.
My degree came from an Interdisciplinary program. Little did I know that 'Interdisciplinary' is becoming a hot hot hot buzzword, especially in medicine and medical research. Part of what makes me such an appealing researcher (Who works with patients) is all the stuff beyond hard sciences that I studied. (A small) Part of what makes me so good at recruiting patients is my sales experience. The application process can make one feel like they are only those things that prospective employers are looking for/ are screening out. But there's this whole other huge category of 'Valuable, but unknown' stuff that gets thrown out in the process, which could help. (Or harm, full disclosure)
I agree. Originally, I wanted to add 'tangible, or intangible' to the question. My master's degree is interdisciplinary by nature. There's not a single course where I won't work with someone from a different faculty. I think being able to communicate with all sorts of fields is a very underappreciated skill, especially among engineers. Some don't realize that "no man is an island" until they've been working for a few years.