The contribution of disorder to the force of friction between a solid film and the substrate in a microbalance friction experiment is calculated using perturbation theory. The disorder gives a much larger force of friction than a defect-free interface if the defect concentration is larger than one part in 10⁵. It is also independent of the sliding velocity. Implications for the interpretation of the experimental results are discussed.
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J. B. Sokoloff (1995) studied this question.
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