In this experiment we plan to collect T-variable x-ray diffraction and PDF on a series of tin-based metal halide perovskite. Performing this experiment will be particularly important to access the average andlocal structure of tin-based halide perovskite of relevance for photovoltaics applications. We expect to clarify the structural stability and the sequence of phase transitions and make a correlation between average and local structures and compare these results to those already obtained by our group on the lead-based analogue materials.