Figure 1

(a) Hard sphere models of the $\mathrm{Cu}\{421{\}}^S$ (left) and $\mathrm{Cu}\{421{\}}^R$ (right) surfaces. The surface unit cell and directions are indicated. The $\{111\}$, $\{100\}$ and $\{110\}$ microfacets are shown (black, dark grey and light grey, respectively). (b) Stereographic projection of the key low-index planes and directions onto each surface portrayed in Fig. 1a; the projection of the (111), (100) and (110) planes are shown in black, dark grey and light grey, respectively. Three nonequivalent planes from the $\{111\}$ family are shown as thin red [medium gray] lines. (c) Experimental XPD data (left) ($h\nu =600\mathrm{eV}$) shown in stereographic projection. Features $A$ to $E$ are ascribed to key forward focussing structures, and are described in the Letter. The right-hand side overlays the stereographic projection of planes associated with the $\{421{\}}^R$ surface as shown in Fig. 1b.Reuse & Permissions

Figure 2

(a) Full-hemisphere FS data taken on $\mathrm{Cu}\{421\}$ ($h\nu =200\mathrm{eV}$); $k^{\parallel }{}_x$ and $k^{\parallel }{}_y$ represent the surface-resolved components of the vacuum wave vector. Features 1 and 2 represent key structures that are discussed accordingly in the Letter. (b) Free electron final-state (FEFS) calculation of the full-hemisphere emission from the FS for the $\mathrm{Cu}\{421{\}}^R$ and $\mathrm{Cu}\{421{\}}^S$ surfaces ($h\nu =200\mathrm{eV}$, $\mathrm{\text{Inner Potential}}=12\mathrm{eV}$). The $k^{\parallel }{}_x$ and $k^{\parallel }{}_y$ surface directions are indicated for each calculation.Reuse & Permissions