Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Formation of a Buffer Layer for Graphene on C-face SiC{0001}   Graphene films prepared by heating the SiC(000-1) surface (the C-face of the
{0001} surfaces) in a Si-rich environment are studied using low-energy electron
diffraction (LEED) and low-energy electron microscopy (LEEM). Upon
graphitization, an interface with rt(43) x rt(43)-R7.6 degree symmetry is
observed by in situ LEED. After oxidation, the interface displays rt(3) x
rt(3)-R30 degree symmetry. Electron reflectivity measurements indicate that
these interface structures arise from a graphene-like "buffer layer" that forms
between the graphene and the SiC, similar to that observed on Si-face SiC. From
a dynamical LEED structure calculation for the oxidized C-face surface, it is
found to consist of a graphene layer sitting on top of a silicate (Si2O3)
layer, with the silicate layer having the well-known structure as previously
studied on bare SiC(000-1) surfaces. Based on this result, the structure of the
interface prior to oxidation is discussed.

37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an