Dependences of angle θ (a, d), PSD of the reflected waves (b, e) and corresponding energy reflection coefficients (c, f) on parameter for various PCMs (amorphous and crystalline GST 225, VO₂) as the substrate material. The values of parameters are: d₂ = 5 nm (a–c), 50 nm (d–f). The values of parameters for all the graphs are: ψ = 0, d_1,3,4 = 0, λ = 650 nm, , μ₂ = 1. The horizontal lines in fig. f characterize energy reflection coefficients for the substrates corresponding to the data in c, f. The black horizontal dashed line in figs. b, e corresponds to the condition Δϕ = 0. Parameter is used as the abscissa axis for all the graphs.