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Impedance of shield outer surface

Definition according to Cigré guide 531 chapter 4.2.1

Symbol
$\mathscr{z}_5$
Unit
$\Omega$/m
Formulae
$\mathscr{z}_{5,sc}$screen
$\mathscr{z}_{5,sh}$sheath
$\mathscr{z}_{5,sh}-\frac{{\mathscr{z}_{4,sh}}^2}{\mathscr{z}_{5,sc}+\mathscr{z}_6+\mathscr{z}_{3,sh}}$composite screen and sheath
Related
$\mathscr{z}_{3,sh}$
Impedance of sheath inner surface [$\Omega$/m]
$\mathscr{z}_{4,sh}$
Mutual impedance of sheath [$\Omega$/m]
$\mathscr{z}_{5,sc}$
Impedance of screen outer surface [$\Omega$/m]
$\mathscr{z}_{5,sh}$
Impedance of sheath outer surface [$\Omega$/m]
$\mathscr{z}_6$
Impedance of insulation between screen and sheath [$\Omega$/m]
Used in
$\mathscr{z}_{ss}$
Impedance external of cable [$\Omega$/m]