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Due to an unfortunate MatLab syntax error, the numerically optimized results report in  were incorrect. The authors thank Dr. Wan Chen, Harbin Institute of Technology, for his interest in our work and for questioning the original results. Revisiting the numerical optimization code, the following results were obtained and confirmed independently for the five-layer cylinder having an outer radius r 5 = λ 0 /10 and being excited by a magnetic line source (MLS) located along the φ = 180 •doi:10.1103/physrevlett.121.249901 fatcat:tm6fziqejfglldjp6ebox3efvi