if the muqtadi does the 2nd salaam before the imaam

الاستفتاء

Assalamu alaikum,I want to ask that if the muqtadi does the 2nd salaam before the imaam,will his namaaz be acceptable?

الجواب حامدا و مصلیا

Even though the Namaz of the concerned person is valid and accepted in the explained circumstance, yet it is not correct to do so purposely.