Removal of intercalated Br-ions from PTI-LiBrand the accompanying loss of the highscattering cross section contributionleads to a broadening of all X-ray diffraction peaks (Table ). In particular, we attribute the broadening of diffraction peaks that have 00lcomponents to the exfoliation and the decreasing height of PTI stacks. The median 002 stacking distance between PTI-sheets increases from 3.5 Å in PTI-LiBr to 3.6 Å in PTI-IF, either due to corrugation or due to intercalation of water molecules.