Teaching Reciprocal Space to Undergraduates via Theory and Code Components of an IPython Notebook J. Chem. Edu. 93 2106 (2016)
Si(111) slab model (xyz file) by Python by Prof. Kakitani at Okayama Univ. of Science.: http://sstweb.ee.ous.ac.jp/doku.php?id=seminar:slabmodel
charge density unit conversion