Cross sections of deposited layers from the divertor of the Joint European Torus (JET) have been investigated, microscopically and by ion microbeam analysis. The thickness of these layers on the studied samples varies between about 50µm and 800µm depending on the exposure time and poloidal location of the sample. The three main constituents of the layers are C, D and Be. For most of the thicker layers laminar structure is observed. In some locations structure is also be observed in the direction parallel to the original surface, as well as more complex structures.