Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The effect of a parallel magnetic field on the Boltzmann conductivity
  and the Hall coefficient of a disordered two dimensional Fermi liquid   Screening of an external random potential by a two dimensional (2D) Fermi
liquid may be strongly dependent on the degree of its polarization. This is
considered as a possible mechanism for the observed strong magnetoresistance of
the 2D electron liquid in the magnetic field parallel to the electron plane. A
Hartree-Fock calculation for the weakly disordered Hubbard model which
qualitatively describes the experiments on the diagonal and the Hall
resisitivity in the finite-temperature metallic state in the high mobility Si
inversion layers is presented.

12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph