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We report a study of the thermodynamic properties of indium clusters on a SiN x surface during the early stages of thin film growth using a sensitive nanocalorimetry technique. The measurements reveal the presence of abnormal discontinuities in the heat of melting below 100 ± C. These discontinuities, for which temperature separation corresponds to a spatial periodicity equal to the thickness of an indium monolayer, are found to be related to the atomic "magic numbers," i.e., the number ofdoi:10.1103/physrevlett.85.3560 pmid:11030950 fatcat:3u4r4h3iz5hc3njs5r4n52rd6i