In this paper we consider in detail the effects of trajectory-dependent electron multiple scattering on planar de-channeling. The most important consequence of reducing the electron multiple scattering of the well channeled ions is to introduce a deeply penetrating tail in the dechanneling curve. This tail is more pronounced at low temperatures when the effect of nuclear multiple scattering is minimized. In the case of planar dechanneling this effect will only have a minor effect on the calculated half lengthx½and the initial dechanneling in the depth region from the surface tox½.