The surface structure of PbTe epitaxial layers on Cd_(0.98)Zn_(0.02)Te(111) grown by molecular beam epitaxy was studied by atomic force microscope.It is shown that the surface is dominated by terraces with triangular shape and anomalous spiral steps.In order to clarify the origin of the triangular shape and spiral steps,PbTe/Cd_(0.98)Zn_(0.02)Te heteroepitaxial layers were investigated by using a high- resolution transmission electron microscope (HRTEM).As a result,it is confirmed that the triangular shape ...