Good day everyone I need some help with clarification on celldm(4)=cos(ab) Does cos(ab) mean the cosine of angle between lattice parameter a and b or it means the cosine of the product of the lattice parameter a and b that is cosine(lattice parameter a*lattice parameter b) when i view my input file using xcrysden it looks like a cubic structure when i used celldm(4)=cos(ab)=0 since angle between a and b is 90 degree but looked like a monoclinic structure when i used cosine(lattice parameter a*lattice parameter b) Am i getting the cos(ab) wrong Many Thanks to everyone on this forum
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