This is a graphite (maybe
but it may not be!) coated paper with a resistance of between 2000 and 3000 ohms per
square metre.

If it is carbon then carbon has a resistivity of about 3.5x10^{-5}
ohm metres. This means that a one metre cube of carbon would have a resistance of
3.5x10^{-5} ohms.

Now our paper has a resistance of say 2500 W per metre square and so we can make a guess at the
thickness.

Using the equation:

Resistivity = [resistance x cross sectional area]/length = [resistance x thickness x width]/length

We will put length = 1 m, width = 1 m
and resistivity = 3.5x10^{-5} ohm metres

This means that we get for the
thickness:

Thickness = 3.5x10^{-5}/2500 = 1.4x10^{-8} m =
1.4x10^{-5} mm.

Seems rather small to me. Maybe the coating is not pure
graphite at all. (It isn't).

Apparently the paper is coated with a graphite-based
material and the suppliers will not tell them what the material is. I reckon it must have a
higher resistivity than carbon and this makes it a thicker
covering.