Mixed material PCB

Mixed material PCB Description:

Mix high frequency material (basic stack up):
  |  ---          ---------- LAYER 1 (TOP LAYER) 0.5OZ+PLATE   
  |                          Pre-Preg 10MIL RO4350B
  |               ---------- LAYER 2 (MID LAYER 1) 0.5OZ
1.6 mm +/-10%     Core FR-4
  |               ---------- LAYER 3 (MID LAYER 2) 0.5OZ
  |                          Pre-Preg 20MIL RO4350B
  |  ---          ---------- LAYER 4 (BOTTOM LAYER) 0.5OZ+PLATE 

Mix aluminum plate:
                  ----------TOP LAYER 0.5OZ
    -----------FR-4 (1.5mm)
    ---------- Aluminum plate (1.0mm)