The effect of parameter on the real and imaginary parts of amplitude reflection coefficients of waves 1 and 2 (a, d), phase differences ϕ_1,2, δ (b, e) and trajectories of the tips of vectors r _1,2 on the complex plane (c, f). The main layer thickness is: d₂ = 4 nm (a, b, c), 40 nm (d, e, f). The values of parameters for all the graphs are: ψ = 0, d_1,3,4 = 0, λ = 550 nm, , μ_β = 1, the main layer material is silver. The black horizontal dashed line in a, b, d, e characterizes equality to zero of the corresponding quantities. The explanations of characteristic points in all the graphs (the points are denoted by small squares, circles, and triangles) are given in a, b. The arrow in c points to the direction of motion on the trajectories (c, f) for increasing values. The inset in f details the data for vector r ₁. Parameters and are used as the abscissa axis for graphs (a, b, d, e) and (c, f), correspondingly.