alpha-GeSe, orthorhombic Pnma, from COD 4003515 (Murgatroyd et al., Chem. Mater. 2020). Rebuilt as an explicit P1 listing of the 8 sites; verified lattice- and site-identical to the validated COD original (density 5.51 g/cm3). Named n-type candidate in Fan & Oganov, J. Mater. Chem. C 9, 13226 (2021).