  We report, an experimental evidence of surface states (SS) driven
magneto-transport in a Bi0.85Sb0.15 single crystal. Detailed high field (up to
12T) and low temperature (down to 2K) magneto-transport measurements are been
carried out on the studied Bi0.85Sb0.15 single crystal. The phase, composition
and Raman modes are studied through X-ray diffraction, Energy dispersive X-ray,
and Raman spectroscopy. The obtained crystal shows non-saturating
magnetoresistance (4250%) at 2K and 12T, along with the existence of weak-anti
localization (WAL) effect at around zero magnetic field. Further, the
Hikami-Larkin-Nagaoka (HLN) analysis is performed to analyse the WAL effect.
The prefactor and phase coherence length are deduced at various temperatures,
which signified the presence of more than one conduction channel in the studied
Bi0.85Sb0.15 single crystal. The effect of quantum scattering, bulk
contribution from underneath the surface states and defects are been studied by
adding various field dependent quadratic, linear and constant terms to the SS
driven HLN equation. Various possible scattering mechanism are studied by
analysing the temperature dependence of the phase coherence length. Angle
dependent magneto-conductivity of the studied Bi0.85Sb0.15 single crystal
clearly confirmed the surface states dominated transport in present crystal.
