(color online) Plots of RL versus frequency of the AgNWs/CB/EVA composites at different AgNW concentrations in the CB/EVA polymer matrix, with EVA-to-CB weight ratios of (a) 1:1, (b) 1:2, (c) 1:3, and (d) 1:4. For all samples, the diameter of Ag nanowire layer sandwiched between two CB/EVA layers is invariable 56 nm, and the thickness of the absorbing layer is fixed at 0.4 mm.