  We present full-polarisation, broadband observations of the radio galaxy NGC
612 (PKS B0131-637) from 1.3 to 3.1 GHz using the Australia Telescope Compact
Array. The relatively large angular scale of the radio galaxy makes it a good
candidate with which to investigate the polarisation mechanisms responsible for
the observed Faraday depth structure. By fitting complex polarisation models to
the polarised spectrum of each pixel, we find that a single polarisation
component can adequately describe the observed signal for the majority of the
radio galaxy. While we cannot definitively rule out internal Faraday rotation,
we argue that the bulk of the Faraday rotation is taking place in a thin skin
that girts the polarised emission. Using minimum energy estimates, we find an
implied total magnetic field strength of 4.2 microG.
