Magnetoreflectivity of\({\mathrm{Pb}}_{1\mathrm{-}\mathrm{x}}\)\({\mathrm{Eu}}_{\mathrm{x}}\)Te epilayers and PbTe/\({\mathrm{Pb}}_{1\mathrm{-}\mathrm{x}}\)\({\mathrm{Eu}}_{\mathrm{x}}\)Te multiple quantum wells