The lattice constant ( \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$a_0$$\end{document} a 0 ), buckling height ( h ), and bond length ( d ) values exhibit an increasing trend with the atomic number of the elements; see Table 1 .
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