Abstract
Monte Carlo calculations are reported for a model of a monolayer film on graphite, which consists of atoms interacting with near-neighbor harmonic forces, situated in a hexagonal-symmetry substrate potential. The results are consistent with a second-order commensurate-incommensurate transition as a function of natural misfit. The domain-wall structure appears to switch from hexagonal symmetry to linear right before the transition occurs. A second-order commensurate-incommensurate transition is also found as a function of temperature at a temperature equal to about half the substrate well depth for a fixed natural misfit equal to 7% of a commensurate-state lattice constant.

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