Figure 2.

Relationship between γ and a/t, where the symbol ο represents the numerical result obtained by the theoretical analysis for indentation of a layered half-space [13], and the solid curve is a least-square fit of Eq. 3.

Muraoka and Komatsu Nanoscale Res Lett 2011 6:33   doi:10.1007/s11671-010-9778-8