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Mutual impedance between cables with earth return

Definition according to Cigré guide 531 chapter 4.2.3.7

This is the mutual impedance between the phase conductor or the metal screen of cable $i$ and the phase conductor or the metal screen of cable $j$, with $d_{ij} as the axial distance between these cables

Symbol
$Z_{ij}$
Unit
$\Omega$/m
Formulae
$R_E+j X_{ij}$
Related
$R_E$
Equivalent resistance of earth return path [$\Omega$/m]
$X_{ij}$
Mutual reactance between two conductors i and j [$\Omega$/m]