Sheet resistance
= Sheet resistance
{title2=$R_\square$}
The resistance per square of a uniform thin conducting sheet. For bulk resistivity $\rho$ and film thickness $t$, $R_\square=\rho/t$ and a rectangular stripe has $R=R_\square L/W$. The number of squares is dimensionless and independent of an overall change of lateral scale. Networks and grids use an effective <sheet resistance> that may depend on finite-size connectivity and contacts.