Organic-inorganic quantum well materials, (CnH 2n+1NH3)2PbX4 (X=I, Br), form self-organized two-dimensional (2D) systems, where inorganic semiconductor well layers are sandwiched by organic barrier layers. Owing to strong quantum confinement and dielectric enhancement effect, ideal 2D-Wannier exciton exists in these materials . It has been founded that the binding energies of the exciton (Eex) and the biexciton (Ebi) are extremely large (Eex ∼360meV and Ebi ∼40meV for (C 6H13NH3)2PbI4 , E ex ∼480meV and Ebi ∼60meV for (C4H 9NH3)2PbBr4 ), which are the largest values ever reported. Thanks to the large binding energies, these materials are quite suitable to investigate various properties of 2D-exciton system. In this study, we have investigated the fine structure of the excitons in (C6H13NH3)2PbI4and (C4H9NH3)2PbBr4 using photo-luminescence (PL) measurement under magnetic field and spin-flip Raman scattering (SFRS) measurement.