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For the sake of simplicity and ease of writing we refer to any bound atom pair on the surface and in its top layer as a dimer, even if it consists of two different atoms. If the atom types are important we will refer to the dimer as an X-Y dimer, with X and Y its constituent atoms. Also a shorter notation will be used where the term "Ge dimers" is used to refer to Ge-Ge dimers and Pt the term "Pt dimers" is used to refer to dimers containing at least 1 Pt atom. For the latter it will follow from the context if this refers to Pt-Ge dimers or Pt-Pt dimers.
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For the sake of simplicity and ease of writing we refer to any bound atom pair on the surface and in its top layer as a dimer, even if it consists of two different atoms. If the atom types are important we will refer to the dimer as an X - Y dimer, with X and Y its constituent atoms. Also a shorter notation will be used where the term "Ge dimers" is used to refer to Ge-Ge dimers and Pt the term "Pt dimers" is used to refer to dimers containing at least 1 Pt atom. For the latter it will follow from the context if this refers to Pt-Ge dimers or Pt-Pt dimers.
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Note that the u and d index only indicate the position in the Ge(001) reconstruction geometry and tells nothing about the relative z position of the Pt atoms with regard to the Ge atom in the specific Pt-Ge dimer.
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