For demonstrative purposes, we also plotted in gray a ratiometric curve of 570 and 535 nm bands to see if monomer / aggregate ratio actually changes all along the compression process. This relative absorption plot saturates at 80 Å2 /m, which mathematically means that absorption intensity of both bands start to grow proportionally from this point. This approves our raft formation assumption, as this is the point where highest density of flat pieces would have been achieved, leading to slipping of rafts on top of each other afterwards. This slipping leads to observed linear proportional growth of both intensities due to layer thickness growth. Also, in solution experiments we were able to see that 3D structures do not produce sharp separate aggregate peaks, thus bulk aggregation may only happen to a small extent.