Editors’ choice for the thematic issue “Synchrotron Radiation and Free Electron Laser Radiation: Generation and Application” is the paper entitled “Features of Cl K-edge XANES Spectra of Transition Metal Complexes {MCl6}n− (M = Rh, Pd, Re, Os, Ir, Pt)” by A.D. Fedorenko, I.P. Asanov, T.I. Asanova, D.B. Vasil’chenko, A.D. Nikolenko, P.A. Piminov, and K.Yu. Karyukina (Bulletin of the Russian Academy of Sciences: Physics, 2023, Volume 87, Issue 5, P. 654-661).