text: 30 
  
  25 
  
  ) 
  . 
  g 
  e 
  d 
  ( 
  
  20 
  
  15 
  *x*
  *a*
  *m*
  *,*
  *z*
  10 
  *Q*
  
  5 
  
  0 
  0  40 
  *T*(K) 
  
  FIG. 8: (color online) Qz, position of the maximum of S(~q), 
  vs. temperature for thickness n = 8. Inset: magnetic vector 
  (mx 
  l ) proﬁle for some temperatures for L = 64. Colors 
  and symbols as in Fig. 2.  FIG. 7: (color online) ∆ϕl(T ) vs. temperature for the surface 
  planes, l = 1 (triangles), l = 2 (squares), l = 3 (diamonds), 
  l = 4 (circles). Straight lines and full symbols: n = 8. Dashed 
  lines and open symbols: n = 16. 
  l , my 