  We theoretically analyze inverse radiofrequency (rf) spectroscopy experiments
in two-component Fermi gases. We consider a small number of impurity atoms
interacting strongly with a bath of majority atoms. In two-dimensional
geometries we find that the main features of the rf spectrum correspond to an
attractive polaron and a metastable repulsive polaron. Our results suggest that
the attractive polaron has been observed in a recent experiment [Phys. Rev.
Lett. 106, 105301 (2011)].
