  We report detailed study of angular-dependent magnetoresistance (AMR) with
tilting angel $\theta$ from $c$-axis ranging from 0$^\circ$ to 360$^\circ$ on a
high-quality FeSe single crystal. A pronounced AMR with twofold symmetry is
observed, which is caused by the quasi two-dimensional (2D) Fermi surface. The
pronounced AMR is observed only in the orthorhombic phase, indicating that the
quasi-2D Fermi surface is induced by the structural transition. Details about
the influence of the multiband effect to the AMR are also discussed. Besides,
the angular response of a possible Dirac-cone-like band structure is
investigated by analyzing the detailed magnetoresistance at different $\theta$.
The obtained characteristic field ($B^*$) can be also roughly scaled in the 2D
approximation, which indicates that the Dirac-cone-like state is also 2D in
nature.
