Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetoresistance and conductivity exponents of quench-condensed
  ultra-thin films of Bi   We have studied the magnetoresistance (MR) and evolution of conductivity with
thickness of quench-condensed Bismuth films on substrates of various dielectric
constants. Our results indicate a negative intial MR proportional to the square
of the magnetic field. The conductance shows a power-law kind of dependence on
thickness, with an exponent close to 1.33, characterisitic of a 2-D percolating
system, only when the films are grown on a thin ($\sim 10${\rm \AA} Germanium
underlayer but not otherwise.

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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-th
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: hep-lat
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The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph