An explicit expression for the surface-impedance tensor of a compressible monoclinic material in a state of plane strain

^** Email: y.fu{at}keele.ac.uk^*** Email: d.w.brookes{at}keele.ac.uk We present an explicit expression for the surface-impedancetensor associated with a compressible monoclinic elastic materialin a state of plane strain. Among a wide range of applications,such an explicit expression can, for instance, be used to writedown an explicit secular equation for the surface or interfacialwave speed, and an explicit bifurcation condition for surfaceor interfacial wrinkling. A previously known quartic secularequation for the surface-wave speed is recovered as a by-product.