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Impedance armour outer surface

Definition according to Cigre TB 531 chap. 4.2.1

Symbol
$\mathscr{z}_{pout}$
Unit
$\Omega$/m
Formulas
$\frac{m_{z,ar} \rho_{ar}}{2\pi r_{z5}} \operatorname{coth}\left(m_{z,ar} \left(r_{z5}-r_{z4}\right)\right)-\frac{\rho_{ar}}{2\pi r_{z5} \left(r_{z4}+r_{z5}\right)}$
Related
$m_{z,ar}$
Parameter m armour
$\pi$
Archimedes' constant $\pi$
$r_{z4}$
Radius armour (inner) [m]
$r_{z5}$
Radius armour (outer) [m]
$\rho_{ar}$
Specific electrical resistivity armour material [$\Omega$.m]