ohm per square

ohm per square
   a unit of resistivity for surface films and other materials whose thicknesses are considered to be negligible. The resistivity of a very thin conductor is defined to be its resistance (in ohms) multiplied by its width and divided by its length. If the conductor is square in shape, then its length and width are the same and its resistivity is numerically equal to the resistance of the square, which is actually the same no matter what the size of the square is. Therefore the resistivity could be stated in ohms, but it is conventional to state it in "ohms per square." One can consider the square to have sides equal to one unit, the size of the unit being immaterial.

Dictionary of units of measurement. 2015.

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