Table 1.

Layer concentration profiles $x_n$ (in units of $\%$-Pd or $\%$-Pt) for clean ${\text{Cu}}_3\text{Pd}(111)$ and ${\text{Cu}}_3\text{Pt}(111)$.

Sample		1st layer	2nd layer	3rd layer	4th layer
		$x_1$	$x_2$	$x_3$	$x_4$
${\text{Cu}}_3\text{Pd}(111)$	Experiment${}^{\mathrm{a}}$	44	22	Bulk(25)	Bulk(25)
	Theorya	50	25	Bulk(25)	Bulk(25)
${\text{Cu}}_3\text{Pt}(111)$	Experimenta	23	33	88	20
	Experiment25	20	31	Bulk(25)	Bulk(25)
	Experiment26	28	8	48	8
	Theorya	100	0	50	Bulk(25)

^aThis work.