The resistivity (a measure of electrical resistance) of graphite is (0.4 to 5.0) × 10-4 ohm . cm in the basal plane. (The basal plane is the plane of the six- membered rings of carbon atoms.) The resistivity is 0.2 to 1.0 ohm . cm along the axis perpendicular to the plane. The resistivity of diamond is 1014 to 1016 ohm . cm and is independent of direction. How can you account for this behavior in terms of the structures of graphite and diamond?