If you are looking to download these files for your own research, the most reliable repositories include:
(x, y, z positions for Formamidinium, Lead, and Iodide). Occupancy and thermal parameters . fapbi3 cif file
For researchers, the CIF file is the "blueprint" used in software like VESTA, Diamond, or Mercury to visualize the crystal and perform DFT (Density Functional Theory) simulations. Key Phases of FAPbI₃ and Their Crystallographic Data If you are looking to download these files