The accepted approximation used to describe quantum interference patterns at steps is shown to be incorrect. As a result, electron lifetimes determined using it are in error by a factor 2.
Cite
@article{arxiv.cond-mat/0410542,
title = {Phase coherence length and quantum interference patterns at step edges},
author = {S Crampin and J Kroeger and H Jensen and R Berndt},
journal= {arXiv preprint arXiv:cond-mat/0410542},
year = {2009}
}