both at the average and at the local level . Similar studies have been also carried out on other lead-based MHPs containing the MA or the FA cation, namely MAPbBr3 8,9 , MAPbCl3 10 , FAPbI3 , and FAPbBr3 5 . On the other hand, the local structure landscape of lead-free MHPs is still poorly characterized, being limited to MASnI3 5 and FASnI3 , despite the huge interest in replacing highly toxic lead with other elements like tin. In this study we performed a systematic characterization of tin-based MHPs with compositions ASnX3, where A= MA, FA and X= I, Br, at various temperatures by means of total scattering and X-ray pair distribution function (PDF) analysis. Data were collected at the Material Science Beamline ID11 at the European Synchrotron Radiation Facility (ESRF) § : details of the synthesis, data collection and analysis can be found in the Electronic Supporting Information (ESI). Rietveld refinements of the diffraction patterns allowed to assess the average structure of these compounds. The results are in good agreement with previous literature reports, with all the four perovskites being cubic, space group Pm3¯m, at room and higher temperature. At the lowest investigated temperature, 80 K, all the compounds adopt an orthorhombic symmetry except for MASnI3, which is tetragonal . A visual inspection of the PDF data collected upon heating from 300 to 360 K (Figure ) shows a small peak broadening and a slight asymmetry for all the compositions, in particular for the first peak around 3 Å that is related to the Sn-X distances. This trend suggests a deviation from the ideal octahedral geometry occurring in a cubic perovskite.