The resonant magneto-optical Kerr effect of an Fe nanofilm at the L-edge was investigated by theoretically and experimentally using the polarization controlled undulator. Large values of the Kerr rotation angle (Be) were measured at the L-2 and L-3 absorption edges for both of s- and p-polarized incident lights. Furthermore, the sign changes of OK depending on the photon energy and the polarization of incident light were also observed. (C) 2016 Elsevier B.V. All rights reserved.