The clean surfaces of quasicrystals, orthogonal to the directions of the main symmetry axes, have a terrace-like appearance. We extend the Bravais' rule for crystals to quasicrystals, allowing that instead of a single atomic plane a layer of atomic planes may form a bulk termination.
@article{arxiv.cond-mat/0412681,
title = {Thick atomic layers of maximum density as bulk terminations of quasicrystals},
author = {Zorka Papadopolos and Gerald Kasner},
journal= {arXiv preprint arXiv:cond-mat/0412681},
year = {2009}
}