Single crystalline CdS layers of some mm2 area and 10-500μ thickness were prepared by epitaxial growth on one dimensionally disordered ZnS platelets. The CdS layers grown on the (0001) and (112̄0) faces of the ZnS platelets were investigated by X-ray diffraction. As crystallographic growth relations were obtained for CdS grown on the ZnS (0001) face. {A figure is presented}. {A figure is presented}. and on the ZnS (112̄) face. {A figure is presented}. the c-axes forming an angle of (66.5±1)°. © 1969.