The behavior of an inhomogeneous superconductor in an external ac field is studied. General equations describing the ac response are formulated. Special attention is paid to the case of a layered conductor containing superconducting islands. A system of this type displays pseudogap properties. The surface impedance Z is evaluated. It is shown that Re Znot equal\ Im Z \ and that their difference is DeltaZproportional toomega(-1/2), where omega is the frequency of the ac field.
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