about 430 nm. Also in this case the two CD spectra are similar but with peaks with opposite sign and, again, the racemic compound has no CD response. For (R/S-ClMBA)2CuCl4 the gCD increases with respect to the MBA samples, giving values two times higher and corresponding to 2.51 × 10 -2 and -2.01 × 10 -2 for the R and S samples, respectively. Such observation of a doubling of the CD response by moving from MBA to ClMBA has reported, to date, only for the 2D lead iodide systems including halogenated organic ligands with different halogens in para position of the benzene ring. In that case the main role was associated to the reduction of the distance between perovskite layers as a function of the chiral ligand and to the presence of a halogen.