Fig. 4

Calculated [area under the curve/error] for (a) 45 nm, (b) 55 nm and (c) 60 nm gold layer thicknesses versus the RI for different water-glycerol concentrations. Red and black curves present the data for \(75^{\circ }\) and \(80^{\circ }\), respectively. Solid and dashed lines represent the data for \(\Psi\) and \(\Delta\), respectively.