  Superfluidity in the quasi-two-dimensional (2D) system of spatially indirect
magnetoexcitons in coupled quantum wells (CQW) and unbalanced two-layer
electron system in high magnetic field $H$ is considered in the presence of a
random field. The problem of the rare gas of magnetoexcitons with dipole-dipole
repulsion in a random field has been reduced to the problem of the rare gas of
dipole excitons without magnetic field with the effective magnetic mass of a
magnetoexciton, which is a function of the magnetic field and parameters of the
CQW, in an $H$-dependent effective random field.
  The density of the superfluid component $n_{s}$ and the temperature $T_{c}$
of the Kosterlitz-Thouless transition to a superfluid state are obtained as
functions of magnetic field $H$, interlayer separation $D$ and the random field
parameters $\alpha_{i}$ and $g_{i}$. For 2D magnetoexcitonic systems, the rise
of the magnetic field $H$ and the interwell distance $D$ is found to increase
the effective renormalized random field parameter $Q$ and suppress the
superfluid density $n_s$ and the temperature of the Kosterlitz-Thouless
transition $T_c$. The suppressing influence of $D$ on $n_s$ and $T_c$ in strong
magnetic filed is opposite to the case without magnetic field, when $n_s$ and
$T_c$ increase with the rise of $D$ at fixed total exciton density $n$. It is
shown that in the presence of the disorder at sufficiently large magnetic field
$H$ or parameters of the disorder there is no superfluidity at any exciton
density.
