Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thin films thickness Measurement by the conductivity theory in the
  framework of born approximation   When the thickness of the layer is smaller than the electrons mean free path,
the morphology affects the conductivity directly based on the layer thickness.
This issue provides basis in order to estimate the thickness of the layer by
understanding the morphology and the value of the conductivity. This method is
an inverse approach on thickness estimation and is applied to various samples.
The comparison of the results with other thickness estimations shows good
consistency. The benefits of this approach is that the only parameter that
needs to be measured is the conductivity, which is quite trivial. Despite the
simplicity of this approach, its results would prove adequate to study both the
material properties and the morphology of the layer. In addition, the
possibility of repeating the measurements on thickness for AC currents with
various frequencies enables averaging the measurements in order to obtain the
most precise results.

30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ