  The new-found two-dimensional antiferromagnetic GdTe$_3$ is attractive owing
to its highest carrier mobility among all known layered magnetic materials, as
well as its potential application for novel magnetic twistronic and spintronic
devices. Here, we have used high-resolution angle-resolved photoemission
spectroscopy to investigate its Fermi surface topology and low-lying electronic
band structure. The Fermi surface is partially gapped by charge density wave
below the transition temperature, the residual part reconstructs making
GdTe$_3$ metallic. The high carrier mobility can be attributed to the sharp and
nearly linear band dispersions near the Fermi energy. We find that the
scattering rate of the linear band near the Fermi energy is almost linear
within a wide energy range, indicating that GdTe$_3$ is a non-Fermi liquid
metal. Our results in this paper provide a fundamental understanding of this
layered Van der Waals antiferromagnetic materials to guide future studies on
it.
