Abstract
Based on our experimental observation of the uniaxial incommensurate ${\mathrm{C}}_{60}$ superlattices formed on Ge(100) and Si(100) surfaces, we show that the balance between the attractive and repulsive intermolecular forces plays the leading role in the ordering of a van der Waals overlayer on anisotropic substrates. A phenomenological expression for the superlattice parameters is derived and shown to be in good agreement with the experiments.
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