Abstract. The results of the study of the polarization properties of the stimulated photon echo (SPE) excited at room temperature on free excitons and exciton states localized on surface defects of textured thin films are reported. The results of observation and investigation of the effect of the non-Faraday rotation of a femtosecond SPE in a textured thin film are presented. The physical processes occurring under the Faraday effect and the effect of the non-Faraday rotation of the photon echo (PE) polarization plane are compared.When the PE is formed in the presence of a longitudinal homogeneous magnetic field, the effect of the non-Faraday rotation of the PE polarization plane takes place. This effect differs fundamentally from the Faraday effect in the physics of the occurring processes and the magnitude of the rotation angle, which is three times bigger in exponent part than the Faraday rotation at the same values of the intensity of the longitudinally applied uniform magnetic field. The angle of the non-Faraday rotation of the PE polarization plane depends on the g factor of the quantum transition of the resonant medium, on the magnitude of the applied magnetic field H and on the time intervals separating the exciting pulses. The PE is formed during the optical transient process when the exciting laser radiation is applied to a resonant medium. The difference between these effects is as follows.When the quantum system is excited by pulses with a duration much shorter than the relaxation times of the resonant medium equally polarized pseudoelectric dipoles are produced on all particles. The process of dephasing (phasing) of these dipoles occurs at different phase velocities for the upper (dextrorotatory) and lower (left-handed) components of the hyperfine structure of the excited level, which is split due to the Zeeman effect. The upper component increases, while the lower component decreases the phase velocity of the precession of the dipole. The resulting phase velocity difference, which leads to the rotation of the polarization plane of the echo signal, increases with increasing magnetic field strength and the time of dephasing (phasing) of the dipoles, given by the value of the time intervals * Corresponding author: Popov@volgatech.net