Assuming an XY resolution of 35µm, I believe these are the angles which will produce a step-free flat surface. This is obviously not possible for every surface of most models but if there’s one you particularly want to be step-free, give this a shot:
0.01: 15.94539590091
0.02: 29.74488129691
0.03: 40.6012946451
0.04: 48.81407483431
0.05: 55.0079798014
(print layer height followed by angle from the build plate)