  There is a clear scarcity of structural parameters for stellar thick discs,
especially for spiral galaxies located in high-density regions, such as galaxy
clusters and compact groups. We have modelled the thin and thick discs of 4
edge-on spirals located in Abell clusters: NGC 705, ESO243G49, ESO187G19,
LCSBS0496P. Deep I band images of NGC 705 were taken from the HST archive,
whereas the remaining images were obtained with the Southern Telescope for
Astrophysical Research (SOAR) in Gunn r filter. They reached surface brightness
levels of $\mu_I \simeq 26.0$ mag arcsec$^{-2}$ and $\mu_r \simeq 26.5$ mag
arcsec$^{-2}$, respectively. Profiles were extracted from the deep images, in
directions both parallel and perpendicular to the major axis. Profile fits were
carried out at several positions, yielding horizontal and vertical scale
parameters for both thin and thick disc components. The extracted profiles and
fitted disc parameters vary from galaxy to galaxy. Two galaxies have a
horizontal profile with a strong down-turn at outer radii, preventing a simple
exponential from fitting the entire range. For the 2 early-type spirals, the
thick discs have larger scalelengths than the thin discs, whereas no trend is
seen for the later types . Both the thin and thick discs sampled tend to have
similar scalelengths and scaleheights when compared to typical field disc
galaxies. However, the thin disc parameters of the 2 farthest galaxies, both
late-type spirals, may be significantly affected by seeing effects. Taken at
face value, our results suggest that environment plays a minor role in
determining the thin and thick disc sizes.
