  The absence of stellar disc truncations in low-inclined spiral galaxies has
been a matter of debate in the last decade. Disc truncations are often observed
in highly inclined galaxies but no obvious detection of this feature has so far
been made in face-on spirals. Here we show, using a simple exponential disc
plus stellar halo model based on current observational constraints, that
truncations in face-on projections occur at surface brightness levels
comparable to the brightness of stellar haloes at the same radial distance. In
this sense, stellar haloes outshine the galaxy disc at the expected position of
the truncations, forcing their studies only in highly inclined (edge-on)
orientations.
