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Impedance between cable k and p in ground

Definition according to Cigré guide 531 chapter 4.2.1

Symbol
$Z_{kp}$
Unit
$\Omega$/m
Formulae
$\frac{\omega \mu_0 \mu_E}{2\pi} \left(\ln\left(\frac{D_E}{d_{kp}}\right)-\frac{2}{3} m_E \left(L_{ck}+L_{cp}\right)\right)$
Related
$D_E$
Equivalent depth of earth return path [m]
$m_E$
Parameter m of earth return
$\mu_0$
Vacuum permeability [H/m]
$\mu_E$
Magnetic permeability of earth [H/m]
$\omega$
Angular frequency [rad/s]
$\pi$
Archimedes' constant $\pi$