PeerJ Author 135 Points Contributions by role Author 135 Contributions by subject area Crystallography Theoretical and Computational Chemistry Transition Metal Chemistry Mohammed Kars PeerJ Author Summary Inorganic Chemistry (other) Main Group Inorganic Chemistry Solid-State Chemistry Transition Metal Chemistry PeerJ Contributions Articles 1 March 30, 2021 X-ray diffraction and theoretical study of the transition 2H-3R polytypes in Nb1+xSe2 (0 < x < 0.1) Mohamed Sidoumou, Soumia Merazka, Adrian Gómez-Herrero, Mohammed Kars, Roisnel Thierry https://doi.org/10.7717/peerj-ichem.2