(C₆H₅CH₂CH₂NH₃)₂CuCl₄ (Cu-PEA) belongs to the layered inorganic-organic K₂NiF₄ perovskite type of general formula A₂ MX₄ , where A = organic cation, M = divalent metal, X = halides. These systems attract special interest owing to their low-dimensional magnetic characteristics. To investigate the effects of the interlayer spacing on the magnetic behavior, various hybrid systems have been developed. In this work, we will present a crystal structure, hydrogen bonds using neutron single crystal diffraction and phase transitions with group-subgroup relations.