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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Dear Dae Kwang Jun<br>
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Equation (1) that you wrote is the correct one. <br>
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And you are right bulk V_AlAs and bulk V_GaAs are obtained in a similar way as in the interface but you need bulk cells. Their values can be anything , positive or negative it does not matter and in fact they are arbitrary.
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Regards,<br>
Mostafa<br>
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