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In classical macroscopic friction bulk plasticity has an important role, but in most experimental investigations of nanoscale single asperity sliding it is absent, with purely interface slip the dominant factor. This is primarily because techniques such as AFM and SFA have very limited dynamic range of stiffness measurement and contact stress. The connection between nanoscale studies and macroscopic friction systems is thus problematic. Explaining the phenomenon of static friction is also difficult. This talk will describe the use of a new 2-D nanoindentation system to investigate the initial stages of lateral deformation of contacts1. We show that static friction depends on indent sink-in arising from the combination of lateral and normal stresses. Material H/E ratio affects the evolution of contact area. As lateral strain increases the limit of junction growth is reached, and the onset of full sliding is controlled by interface friction …