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The 2.1 GHz radio source catalogue of the 25 deg$^2$ ultimate XMMextragalactic survey south (XXL-S) field, observed with the Australia TelescopeCompact Array (ATCA), is presented. The final radio mosaic achieved aresolution of $\sim$$4.8"$ and a median rms noise of $\sigma \approx41$$\mu$Jy/beam. To date, this is the largest area radio survey to reach this fluxdensity level. A total of 6350 radio components above 5$\sigma$ are included inthe component catalogue, 26.4% of which are resolved. Of these components, 111were merged together to create 48 multiple-component radio sources, resultingin a total of 6287 radio sources in the source catalogue, 25.9% of which wereresolved. A survival analysis revealed that the median spectral index of theSydney University Molonglo Sky Survey (SUMSS) 843 MHz sources in the field is$\alpha$ = $-$0.75, consistent with the values of $-0.7$ to $-0.8$ commonlyused to characterise radio spectral energy distributions of active galacticnuclei (AGN). The 2.1 GHz and 1.4 GHz differential radio source counts arepresented and compared to other 1.4 GHz radio surveys. The XXL-S source countsshow good agreement with the other surveys.

The XXL Survey XVIII. ATCA 2.1 GHz radio source catalogue and source counts for the XXL-South field