In the unzipped Gerber folder,
1. note the filename suffix of the layer you do not want;
2. delete the file for the layer you do not want;
3. copy the file for the layer that you do want to duplicate;
4. paste it into the folder and change the suffix to the one that you noted in step(1);
5. **Check** **your** **results** **in** **Gerbv****.**
Done.
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