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Mutual impedance of shield

Refer to 'Electromagnetic Transients in Power Cables', F.F. da Silva, C.L. Bak (2013)

Symbol
$\mathscr{z}_{4,s}$
Unit
$\Omega$/m
Formulae
$\frac{m_{z,s} \rho_s}{\pi \left(r_{z2,sc}+r_{z3,sh}\right)} \frac{1}{sinh\left(m_{z,sc} \left(r_{z3,sh}-r_{z2,sc}\right)\right)}$
Related
$m_{z,s}$
Parameter m of shield
$m_{z,sc}$
Parameter m of screen
$\pi$
Archimedes' constant $\pi$
$r_{z2,sc}$
Radius of screen (inner) [m]
$r_{z3,sh}$
Radius of sheath (outer) [m]
$\rho_s$
Specific electrical resistivity of shield [$\Omega$.m]