  Radiative emission from an open-ended unflanged planar dielectric waveguide
is studied for the case of TM polarization on the basis of an iterative scheme.
The first step of the scheme leads to approximate values for the reflection
coefficients and electromagnetic fields inside and outside the waveguide. It is
shown that for the related problems of reflection from a step potential in
one-dimensional quantum mechanics and of Fresnel reflection of an
electromagnetic plane wave from a half-space the iterative scheme is in
accordance with the exact solution.
