For our Manufacturing class, one of our take-home quizzes is to find out why, as surface roughness continues to decrease (think of very finely polished materials) the static friction between the plates as you try and slide them will increase. Basically, really rough surfaces will be hard to slide and really fine surfaces will also be hard to slide. We can use any sources and the explanation must be in-depth (driven down to pretty much the molecular level). As of now, we're having difficulty finding information and I figured some of you guys here might know where to look (we've been searching Google Scholar, Web of Science, etc.).