The p(2×{}2) phase of oxygen on a stepped Ru(0001) surface (13±{}2 atomic rows per terrace, steps parallel to close-packed rows) exhibits long-range order also across the steps and undergoes a continuous order-disorder phase transition. Critical exponents {β}, {γ}, and {ν} were determined by LEED from the temperature dependence of LEED peak intensities and spot profiles of superstructure spots in the range 0.01{}(T-Tc)/Tc{}0.2 both parallel and perpendicular to the step edges. Exponent values are close to those of the 2D-Ising class and equal for both directions.
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Sokołowski et al. (1989) studied this question.
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