  We perform Hartree calculations of symmetric and asymmetric semi-infinite
nuclear matter in the framework of relativistic models based on effective
hadronic field theories as recently proposed in the literature. In addition to
the conventional cubic and quartic scalar self-interactions, the extended
models incorporate a quartic vector self-interaction, scalar-vector
non-linearities and tensor couplings of the vector mesons. We investigate the
implications of these terms on nuclear surface properties such as the surface
energy coefficient, surface thickness, surface stiffness coefficient, neutron
skin thickness and the spin-orbit force.
