<div dir="ltr">Dear User<div>How to fix an layer in wien2k during relaxation? In many cases I read the we fixed bottom but allowed the top layer to be relaxed, although it is not very much recommended when we talk about isolated surface, but I guess we can fix the middle layer and allow the top and bottom layers to be relaxed. </div><div><br></div><div>Other query is the after Si (100) reconstruction one of the two dangling bonds for each Si is left at the surface. Why we do not need to add H (though we called this a stable surface but why?) ? Will it not add metallic behavior?</div><div><br></div><div>Last one: Is it right that for reconstruction we need to perturb positions of surface Si a few times and the to required to run relaxation? Suppose unperturbed positions for surface two Si (in p(2*1) phase) are (0.960004, 0.960004, 15.7517) and (4.80002, 0.960004, 15.7517) then how much perturbation is necessary and should it be in all direction (x, y , z)?<br>-- <br><div class="gmail_signature"><div dir="ltr"><div>Kind Regards</div><div>Muhammad Sajjad </div><div>Post Doctoral Fellow</div><div>KAUST, KSA.</div></div></div>
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