  Metallic Bi2Te3 crystalline sheets with the room-temperature resistivity of
above 10 m{\Omega} cm were prepared and their magnetoresistive transport was
measured in a field of up to 9 Tesla. The Shubnikov de Haas oscillations were
identified from the secondly-derived magnetoresistance curves. While changing
the angle between the field and normal axis of the sheets, we find that the
oscillation periods present a cosine dependence on the angle. This indicates a
two-dimensional transport due to the surface state. The work reveals a
resolvable surface contribution to the overall conduction even in a metallic
topological insulator.
