Figure 6: Plot of for the different values of : 1 – ; 2 – ; 3 – ; 4 – ; 5 – ; 6 – (linear case). The following parameters are used for both cases: , , , and for the nonlinear case . Dashed lines are described by formulas: (lower bound for ), (upper bound for in the case of linear medium in the layer). Curves (solid) 1–5 are solutions of (7.14), and curve 6 (dashed) is solutions of (8.1).