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We present results from deep and very spatially extended CTIO/DECam $g$ and$r$ photometry (reaching out to $\sim$ 2 mag below the oldest MSTO and covering$\sim$ 20 deg$^2$) around the Sextans dSph. We use this data-set to study thestructural properties of Sextans overall stellar population and its differentstellar evolutionary phases, as well as to search for signs of tidaldisturbance from the MW, which would indicate departure from dynamicalequilibrium. We perform the most accurate structural analysis to-date ofSextans' stellar components by applying Bayesian MCMC methods to the individualstars' positions. Surface density maps are built by decontaminating the samplethrough a matched filter analysis of the CMD, and then analysed for departuresfrom axisymmetry. Sextans is found to be considerably less spatially extendedthan early studies suggested. No significant distortions or tidal disturbancesare found down to a surface brightness of $\sim$ 31.8 mag/arcsec$^{-2}$ inV-band. We identify an overdensity in the central regions that may correspondto previously reported kinematic substructure(s). In agreement with previousfindings, old $\&$ metal-poor stars such as BHB stars cover a much larger areathan stars in other evolutionary phases, and bright BSs are less spatiallyextended than faint ones. However, the different spatial distribution of brightand faint BSs appears consistent with the general age/metallicity gradientsfound in Sextans' stellar component. This is compatible with BSs having formedby evolution of binaries and not necessarily due to the presence of a centraldisrupted globular cluster, as suggested in the literature. We providestructural parameters for the various populations analyzed and make publiclyavailable the photometric catalogue of point-sources as well as a catalogue ofliterature spectroscopic measurements with updated membership probabilities.

Tracing the stellar component of low surface brightness Milky Way Dwarf Galaxies to their outskirts I: Sextans