“…where c is the speed of light in free space andε is the permittivity tensor, which yield a set of four equations for the horizontal components E ⊥ (n ⊥ , z), H ⊥ (n ⊥ , z) (in a case of a source-free medium, see, e.g., Budden, 1985, Bespalov et al, 2018, and Mizonova, 2019 dF /dz =MF + Z 0 I δ(z − z s ).…”