Therefore, the broad vs. sharp emission in Sn-and Pb-systems can be assigned for localized (STE The computational results confirm the ability of the ClMBA chiral ligands to induce a band splitting which correlates to the emergence of chiroptical properties. Based on the present evidence, the origin of such an effect can be related to the symmetry-breaking distortions in the inorganic layers associated with the ligands. For (R/S-ClMBA)2SnI4, this occurs at the level of the average structure and not to possible local asymmetry within the inorganic framework. Indeed, Mitzi and co-workers highlighted the role of structural descriptor in 2D hybrid perovskites suggesting that spin-splitting could be related to a specific in-plane component of the disparity in adjacent M-X-M bond angles, namely the distortion level of the inter-octahedral bond angles (defined as (Δβin). Such parameter scales linearly with the effective α value (calculated from DFT) for a series of chiral and achiral 2D perovskites.