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(a,b) Measured (blue-solid) and simulated (red-dashed) RCS ratio [Eq. (4)] for normal-incidence and backscattering-direction (θ = θi = 0, obtained with the setup in Fig. S2a in the Supplementary Information), as a function of frequency, for the GRS P2- and P5-type designs, respectively. The coding sequences and corresponding layouts are explicitly given in Table S1 and Fig. S1 in the Supplementary Information.
