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The relativistic KS equations are
Dirac-like equations for a spinor with a ``large'' 
Rnlj(r) and
a ``small'' 
Snlj(r) component:
| c   +   Rnlj(r) | = |  2mc2 - V(r) + ε  Snlj(r) | (9) | 
| c   -   Snlj(r) | = |  V(r) + ε  Rnlj(r) | (10) | 
 
where j is the total angular momentum (j = 1/2 if l = 0, 
j = l + 1/2, l - 1/2 otherwise); 
κ = - 2(j - l )(j + 1/2) is the Dirac 
quantum number (κ = - 1 is l = 0, 
κ = - l - 1, l otherwise);
and the charge density is given by
| n(r) =  Θnlj  . | (11) |