Thanks for your reply.
Let me check again
So 0.152mm LF thickness targeting at the gap 0.010mm can still control the lead half etch depth to be within the spec.(0.075+/-0.025mm)
Whether 0.203mm LF thickness also can control the tie bar and lead half etch depth gap below 0.01mm,the lead half etch depth can control our spec or not.(0.1+/-0.03mm)