Abstract
A model for the commensurate-incommensurate transition in two dimensions is proposed in the case of hexagonal symmetry. The incommensurate phase is described as an array of walls forming an irregular honeycomb network. At low temperatures, a first order transition is predicted in all cases, in disagreement with experiments in krypton monolayers on graphite. This disagreement might be produced by substrate mediated long range forces which have been neglected in the present model. The effect of dislocation and finite size has also to be considered.
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