  We discuss the surface impedance (Z=R-iX) of a normal-metal/superconductor
proximity structure taking into account the spin-dependent potential at the
junction interface. Because of the spin mixing transport at the interface,
odd-frequency spin-triplet s-wave Cooper pairs penetrate into the normal metal
and cause the anomalous response to electromagnetic fields. At low temperature,
the local impedance at a surface of the normal metal shows the nonmonotonic
temperature dependence and the anomalous relation R>X. We also discuss a
possibility of observing such anomalous impedance in experiments.
