I repeated the simulation from https://mccullerlab.com/logs/lab/index.php?callRep=11445 but with a coating thickness of 40 um instead of 20 um. I doubled the amount of mesh elements in the coating so that the mesh density of the coating remained the same. The PSD in the coating at 12.5 MHz and 13 MHz, which are roughly centered between the peaks, are 2.3x higher and 3.38x higher, respectivly. The eigenfrequency of the bulk longitudinal mode is lower since the optic is 1% thicker. For the simplest test of how the total loss angle gets calculated, I am going to go back to a low Q silicon coating.