P. W. Stephens, P. Heiney, R. J. Birgeneau, and P. M. Horn, Phys. Rev. Lett. 43, 47-51 (1979).
We describe an x-ray scattering study of the commensurate-incomennsurate transition in monolayer Kr films physisorbed onto basal planes of z-y-x exfoliated graphite. At temperatures of 80.0 and 89.3 K there appears to be a single hexagonal-commensurate-to-hexagonal-incommensurate transition which is at least nearly second order with mean exponent beta=0.30+-/0.06. In the incommensurate phase we directly observe domain-wall superlattice effects.
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