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The sliding frictional force of a liquid submonolayer in contact with a random rough surface in an oscillatory motion is considered. The frictional force is proportional to the square of the sliding velocity v, Ff~v^2, with a proportionality factor that depends on the particular roughness configuration. Analytic calculations are performed for self-affine roughness characterized by the roughness exponent 0

Roughness effects on the sliding frictional force of submonolayer liquid films on solid substrates