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The sliding motion of gold slabs adsorbed on a graphite substrate issimulated using molecular-dynamics. The central quantity of interest is themean lateral force, i.e., the kinetic friction rather than the maximum lateralforces, which correlate with the static friction. For most set-ups, we findStokesian damping to resist sliding. However, velocity-insensitive (Coulomb)friction is observed for finite-width slabs sliding parallel to the armchairdirection if the bottommost layer of the three graphite layers is kept at zerostress rather than at zero displacement. Although the resulting kineticfriction remain much below the noise produced by the erratic fluctuations of(conservative) forces typical for structurally lubric contacts, the nature ofthe instabilities leading to Coulomb friction could be characterized asquasi-discontinuous dynamics of the Moir\'e patterns formed by the normaldisplacements near a propagating contact line. It appears that the interactionof the graphite with the second gold layer is responsible for the symmetrybreaking occurring in the interface when a contact line moves parallel to thearmchair rather than to the zigzag direction.

Structural lubricity of physisorbed gold clusters on graphite and its breakdown: Role of boundary conditions and contact lines