Merge Multiple .TXT files

Hello,

I need to merge multiple .txt files into one txt file. Can someone help with a powershell script for that? Also will it be possible to cut off the headers in each of the files and just have one? For example

File1.txt

© 2014 by Heathrow Capital, Inc.
HCMarketData 1234569 2233 FINAL    
G CCAVD 20141 9.4215
G FROOK 20141 9.8248
G RSVVP 20141 6.0302

File2.txt

© 2014 by Heathrow Capital, Inc.
HCMarketData 1234569 2233 FINAL    
R HHHH 20141 9.4215
R HHDG 20141 9.8248
R GGHD 20141 6.0302

Thanks,