Impedance between cable k and p in ground

Definition according to Cigre TB 531 chap. 4.2.1

Symbol
$Z_{kp}$
Unit
$\Omega$/m
Formulas
$\frac{\omega \mu_0 \mu_E}{2\pi} \left(\ln\left(\frac{D_E}{d_{kp}}\right)-\frac{2}{3} m_E \left(L_{ck}+L_{cp}\right)\right)$