This is something that has been bugging me. When using the Select Layer by Location tool, what is the difference between the overlap types, "Within" and "Completely Within?" I'm working on scripting an analysis of the count of 30 sqft transverse hexagon grid cells inside a polygon. I have yet to see any difference in the count when switching between these two options. Ideally, I would like to have a within option with a user defined threshold, i.e. if 95-99% of the feature in the input layer falls within the selecting layer, include this in the selection.