[en] The work is concerned with complex investigations of the layers of porous indium phosphide (por-InP) using X-ray diffraction and IR-spectroscopy, ultrasoft X-ray emission spectroscopy (USXES), spectroscopy of X-ray near-edge absorption fine structure XANES (X-ray absorption near-edge structure) and photoluminescence, obtained by anodic pulse electrochemical etching of single-crystalline plates of InP(1 0 0) of n-type conductivity (n ∼ 10¹⁸). The data obtained as a result of this work demonstrated that the surface layers of por-InP have cluster structure with the formation of InP quasi-molecules