At 0.01 M KCl and LT, we observed two different domains within the films. Parts of the films were uniform, but some sections were multilayered. The tension caused by compression was probably released in these regions, resulting in the continuous collapse. We did not observe any kink or feature of the surface isotherms curve, which could be easily associated with the collapse of the film. The film became multilayered continuously, without sudden disruption of the 2D structure. At HT, films were ordered, but deposits, probably salt, were visible. At both temperatures, the thickness of the films measured using a profilometer corresponded to around 60 nm, i.e., the diameter of PSiFe, proving the films were monolayers.