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Mutual reactance between conductors flat formation without transposition

Definition according to IEC 60287-1-1. $X_m$ is the mutual reactance per unit length of cable between the sheath of an outer cable and the conductors of the other two, when the cables are in flat formation without transposition.
Definition for flat and rectangular arrangement can also be found in publication 'General Calculations Excerpt from Prysmian Wire and Cable Engineering Guide' (2015). The parameter is called $A$ instead of $X_m$.

Symbol
$X_m$
Unit
$\Omega$/m
Formulae
$\omega \frac{\mu_0}{2\pi} \ln2$
Related
$\mu_0$
Vacuum permeability [H/m]
$\omega$
Angular frequency [rad/s]
$\pi$
Archimedes' constant $\pi$
Used in
$M_e$
Substitution coefficient $M_e$ to calculate factor $F_e$
$N_e$
Substitution coefficient $N_e$ to calculate factor $F_e$
$P_X$
Substitution coefficient P to calculate loss factor by circulating currents
$Q_X$
Substitution coefficient Q to calculate loss factor by circulating currents
$\xi_X$
Parameter $\xi$ for calculation of loss factor