Abstract
Topmost interlayer spacings and three measures of their associated uncertainties obtained with the reliability index proposed recently by Pendry (1980) are compared with results available from the authors' previous analyses with the reliability index proposed by Zanazzi and Jona for the surfaces Ni(311), Cu(311), Zr(0001), Rh(110)-c(2*2)-S and Rh(100)-(2*2)-S. Structural conclusions are essentially identical from both approaches. Advantages of the Pendry approach include its much shorter times for computation, and its tendency to give lower uncertainties for the interlayer spacing.
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