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In transition metal (M) compounds, the partial substitution of the host transition metal (Mh) to guest one (Mg) is effective to improve the functionality. To microscopically comprehend the substitution effect, degree of distribution of Mg is crucial. Here, we propose that a systematic EXAFS analysis against the Mg concentration can reveal the spatial distribution of Mg. We chose NaCo1-xFexO2 as a prototypical M compound and investigated the local intermetal distance around the guest Fedoi:10.1038/s41598-020-68147-3 pmid:32647321 fatcat:smam4ghxlbhsbgjgtsbks5ncum