ABSTRACT
It is of great importance to clarify the correlation between the normal and superconducting properties of high-Tc superconductors (HTSs) and their two-dimensional electronic nature associated with the layered crystal structures. High anisotropics in various normal-state transport properties can be understood by modeling the HTSs to be that the conducting Cu02 layer and other insulating or less conducting layers are alternately stacked and the electron conduction mainly takes place two dimensionally in the Cu02 layer [1-3]. Because of the short coherence, a quasi-two-dimensional superconducting state is also possible; that is, the superconducting order parameter may abruptly change from one layer to another along the c axis.
