The electromagnetic propagator associated with the localized collective magnetoplasmon excitations in a semiconductor superlattice with broken translational symmetry, is calculated analytically within linear response theory.We discuss the properties of these collective excitations in both radiative and nonradiative regimes of the electromagnetic spectra.We find that low frequency retarded modes arise when the surface density of carriers η d at the symmetry breaking layer is lower than the density η 0 at the remaining layers.Otherwise (η d > η 0 ) a doublet of localized, high-frequency magnetoplasmon-like modes occurs.The corresponding dispersion law and power spectrum of these modes are shown.