Abstract
We observe Bragg peaks in the elastic backscattering probability of monoenergetic positrons from the [0001] surface of highly oriented pyrolytic graphite. The position of most of the peaks can be explained by a plane spacing $d$, slightly contracted from the bulk value and a +1.4\ifmmode\pm\else\textpm\fi{}0.5-eV positron work function for this surface. An unexpected peak at $\frac{\mathrm{kd}}{\ensuremath{\pi}}=3.5$, where $\ensuremath{\hbar}k$ is the positron momentum, could be due to multiple-scattering effects.
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