we know that UFF4MOF optimizes all cell parameters. I am searching for a way that fixing the Z direction and optimize Y and X cell parameters especially for SURMOF. In VASP and QE ve have a VCrelax that relaxes the system and unit-cell. but I want to fix one unit-cell. The idea of doing this optimization manually is not good since I have a molecule in MOF as linkers that can rotate. so maybe if GULP can do it will be soo good.