  We theoretically study the normal phase properties of strongly interacting
two-component Fermi gases in two spatial dimensions. In the limit of weak
attraction, we find that the gas can be described in terms of effective
polarons. As the attraction between fermions increases, we find a crossover
from a gas of non-interacting polarons to a pseudogap regime. We investigate
how this crossover is manifested in the radio-frequency (rf) spectroscopy. Our
findings qualitatively explain the differences in the recent rf spectroscopy
measurements of two-dimensional Fermi gases [Sommer et al., Phys. Rev. Lett.
108, 045302 (2012) and Zhang et al., Phys. Rev. Lett. 108, 235302 (2012)].
