I’m trying to create a hcp-structure where the first basis atom should be assigned to W and the second basis atom should be assigned to C. In order to do this I specified my custom lattice vectors and corresponding basis, but when I try use the “create_atoms 1 region box basis 1 1” for the W-atoms it places W on the second basis as well. I interpret the command in the documentation as follow : I assign the type 1 atoms to the first basis atom in the corresponding box lattice. Obviously I’m doing something wrong here. I would appreciate any suggestions, since I clearly am misunderstanding the documentation. Thanks in advance.