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Using molecular dynamics based on Langevin equations with a coordinate- andvelocity-dependent damping coefficient, we study the frictional properties of athin layer of "soft" lubricant (where the interaction within the lubricant isweaker than the lubricant-substrate interaction) confined between two solids.At low driving velocities the system demonstrates stick-slip motion. Thelubricant may or may not be melted during sliding, thus exhibiting either the"liquid sliding" (LS) or the "layer over layer sliding" (LoLS) regimes. TheLoLS regime mainly operates at low sliding velocities. We investigate thedependence of friction properties on the misfit angle between the slidingsurfaces and calculate the distribution of static frictional thresholds for acontact of polycrystalline surfaces.

Dependence of boundary lubrication on the misfit angle between the sliding surfaces