Some areas resembled films at pure water, i.e., barely visible and uniform. More distinct, "solidlike" aggregates were also present. During decompression, network-like aggregates appeared, as at pure water. Increasing the content of KCl in the subphase resulted in a solid-like layer with large floes formed almost directly upon applying PSiFe at the interface. After decompression, the film broke into solid-like and relatively large pieces.