  Quantum oscillations in both linear and Hall resistivities and weak
antilocalization (WAL) are barely observed in bulk single crystals. Here we
report the transport properties of a CaCuSb single crystal that crystallizes in
the hexagonal crystal structure. The magnetotransport studies reveal WAL and
Shubnikov-de Haas (SdH) quantum oscillations with a unique frequency at 314 T.
A cusp-like behavior in the low field regime of magnetotransport for J //
(ab)-plane and B // [0001] confirms the WAL in CaCuSb. Angular-dependent
normalized magnetoconductance and SdH oscillations studies reveal that the
observed phenomena originate from the 2D transport channels. The high magnetic
field (up to 45 T) experiments demonstrate plateau-like features in the Hall
measurements. The first-principles calculations unfold that CaCuSb is a
non-topological semimetal with dominant hole carries at the Fermi level. Our
study reveals that CaCuSb is a promising candidate to explore the quasi-2D
quantum transport phenomenon in the transition metal pnictide materials.
