Magnetic moments have been determined for the fct and bcc structural phases of Fe, stabilized on the (100) surface of Cu, from magnetic-circular-dichroism measurements. For the thin fct films, the spin and orbital moments are greatly increased to 3.4(7)${\mathrm{\mu }}_{\mathit{B}}$ and 0.24(5)${\mathrm{\mu }}_{\mathit{B}}$, respectively. The larger moments found for the fct films scale with an increased energy shift in the position of the $L_3$ and $L_2$ absorption peaks. In addition, insight is gained into the energy governing the perpendicular anisotropy of the fct phase.

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