Classical trajectory simulations are used to determine the energy transfer distribution function P(E f ) for Ne-atoms scattering off the n-hexylthiolate self-assembled monolayer (SAM)/Au{111} surface. The form of P(E f ) depends on the angles at which it is measured. Though trapping desorption is insignificant for this system, backward scattering and scattering normal to the surface give rise to a unimodal P(E f ) in excellent agreement with the Boltzmann distribution. Forward scattering at large polar angles is bimodal with a Boltzmann-like component. These simulation results show that a Boltzmann component in P(E f ) does not necessarily correspond to a trapping desorption intermediate.