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We present a new image of the 5.5 GHz radio emission from the extendedChandra Deep Field South. Deep radio observations at 5.5 GHz were obtained in2010 and presented in the first data release. A further 76 hours of integrationhas since been obtained, nearly doubling the integration time. This paperpresents a new analysis of all the data. The new image reaches 8.6 microJy rms,an improvement of about 40% in sensitivity. We present a new catalogue of 5.5GHz sources, identifying 212 source components, roughly 50% more than weredetected in the first data release. Source counts derived from this sample areconsistent with those reported in the literature for S_{5.5GHz} > 0.1 mJy butsignificantly lower than published values in the lowest flux density bins(S_{5.5GHz} < 0.1 mJy), where we have more detected sources and improvedstatistical reliability. The 5.5 GHz radio sources were matched to 1.4 GHzsources in the literature and we find a mean spectral index of -0.35 +- 0.10for S_{5.5GHz} > 0.5 mJy, consistent with the flattening of the spectral indexobserved in 5 GHz sub-mJy samples. The median spectral index of the wholesample is \alpha_{med} = -0.58, indicating that these observations may bestarting to probe the star forming population. However, even at the faintestlevels (0.05 < S_{5.5GHz} < 0.1 mJy), 39% of the 5.5 GHz sources have flat orinverted radio spectra. Four flux density measurements from our data, acrossthe full 4.5 to 6.5 GHz bandwidth, are combined with those from literature andwe find 10% of sources (S_{5.5GHz} >~ 0.1 mJy) show significant curvature intheir radio spectral energy distribution spanning 1.4 to 9 GHz.

The ATLAS 5.5 GHz Survey of the Extended Chandra Deep Field South: The Second Data Release