Commensurate-incommensurate transition of solid krypton monolayers on graphite

Low-energy electron-diffraction (LEED) data for the commensurate-incommensurate transition in solid krypton monolayers on graphite are reanalyzed and compared to recent x-ray diffraction data. For the temperature range 52 to 89 K, the mean misfit versus chemical potential change for both sets of data can be expressed as a power law with an exponent of about 1/3. The critical pressure at which the transition occurs is consistent with Pc(T)=(4.5×10⁺⁹Torr) exp(-1990K/T) for $52<T<123$ K. Analysis of the LEED photographs at 52 K indicates that the krypton monolayer starts to rotate in an apparently second-order transition when the mean misfit exceeds two percent.