  The problem of a general, symmetric contact, between elastically similar
bodies, and capable of idealisation using half-plane theory, is studied in the
presence of interfacial friction. It is subject to a constant set of loads -
normal force, shear force and bulk tension parallel with the interface -
together with an oscillatory set of the same quantities, and is in the steady
state. Partial slip conditions are expected to ensue for a range of these
quantities, and the permanent stick zone is explicitly established, thereby
effectively specifying the maximum extent of the slip zones. Exact and
approximate, easy to apply recipes are obtained.
