  We report results of a magneto-transport study on thin films of the
topological semi-metal candidate PdSb$_{2}$ (PS). We observe a positive
correction to magneto-conductivity at low temperatures, which is a signature of
weak anti-localization (WAL). We analyze the WAL data within the
Hikami-Larkin-Nagaoka (HLN) theory and extract the dephasing length
(L$_{\phi}$) whose temperature dependence reveals the various phase relaxation
mechanisms. From the WAL effect, we also extract $\alpha$ (the number of
transport channels). The evolution of $\alpha$ with temperature and film
thickness reflects how the coupling between different conducting channels
(Topological surface channels and bulk channels) changes. Additionally, the
electron-electron interaction (EEI) effect was observed in the
temperature-dependent conductivity at low temperatures. From the EEI effect, we
get an alternate estimate of the number of transport channels and obtain a
value similar to that obtained from the analysis of the WAL effect. This
suggests that in disordered films, the EEI effect can be used to get
information about the coupling of the topological surface states with each
other and with bulk states.
