Layered perovskites (RNH₃)₂CuCl₄ were synthesized, where R was C₆H₅(CH₂)-, C₆H₅(CH₂)₂-, 1-C₁₀H₇(CH₂)-, 2-C₁₀H₇(CH₂)-, 1-C₆H₅N=NC₆H₄O(CH₂)₃- and 1-C₆H₅COC₆H₄O(CH₂)₃-. These complexes showed ferromagnetism, with different Curie temperatures, T_c, depending on the structure of the molecules. These T_c seem to be independent of the distance of interlayer space between CuCl-based layers. The complexes with naphthalene showed lower T_c than those with benzene. Since naphthalene has more π-electrons than benzene, the degree of electronic state mixing between the organic and the inorganic layers might change and affect the interlayer magnetic interaction J'.