  As nature junction geometry of the d-wave cuprate
superconductor/insulator/the mixture of s-wave and d-wave cuprate
superconductor, the upmost surface junction of intrinsic Josephson junction
stack fabricated on Bi$_2$Sr$_2$CaCu$_2$O$_{8+d}$ single crystals was measured
and discussed. We successfully observed half-integral microwave induced steps
as well as integral steps with resistively shunting technology, which shows the
evidence of second order supercurrent, consistent with Tanaka's theory.
