  We construct a semiholographic effective theory in which the electron of a
two-dimensional band hybridizes with a fermionic operator of a critical
holographic sector, while also interacting with other bands that preserve
quasiparticle characteristics. Besides the scaling dimension $\nu$ of the
fermionic operator in the holographic sector, the effective theory has two
{dimensionless} couplings $\alpha$ and $\gamma$ determining the holographic and
Fermi-liquid-type contributions to the self-energy respectively. We find that
irrespective of the choice of the holographic critical sector, there exists a
ratio of the effective couplings for which we obtain linear-in-$T$ resistivity
for a wide range of temperatures. This scaling persists to arbitrarily low
temperatures when $\nu$ approaches unity in which limit we obtain a marginal
Fermi liquid with a specific temperature dependence of the self-energy.
