The keratin layer has become dislodged (filamentous) from the cells during preparation of the specimen. In its natural state, it would be only a few microns thick. Consequently, the keratin layer is less thick than the cellular layer in thin skin.
Because skin is exposed to air, it is keratinized to protect the surface from abrasion and is lubricated by glycolipids to protect it from dehydration.
The basement membrane is too thin to be identified in this specimen.