The photoelectron attenuation through layers of arachidic acid in a Langmuir-Blodgett film has been investigated by measuring the photocurrent. The photoelectrons were generated by the two-photon ionization of rhodamine B on a NESA glass substrate. The electron attenuation length was determined to be 4.2 nm for photoeletrons with a kinetic energy of 0.5-1.1 eV. The value did not depend on the applied electric field of 1.25-3.75 kV/cm.