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The static friction between crystalline surfaces separated by a molecularlythin layer of adsorbed molecules is calculated using molecular dynamicssimulations. These molecules naturally lead to a finite static friction that isconsistent with macroscopic friction laws. Crystalline alignment, slidingdirection, and the number of adsorbed molecules are not controlled in mostexperiments and are shown to have little effect on the friction. Temperature,molecular geometry and interaction potentials can have larger effects onfriction. The observed trends in friction can be understood in terms of asimple hard sphere model.Comment: 13 pages, 13 figure

Simulations of the static friction due to adsorbed molecules