We can tilt the pixel barrel modules by specifying the coordinates of each module. The syntax is as follows:

Barrel PXB {
  numLayers 4
  //numModules 4
  maxZ 205                    <--- need to specify maxZ if using titled modules
  innerRadius 29
  outerRadius 161
  width 22
  length 71
  smallParity 1
  bigParity -1
  Layer 2 { tiltedLayerSpecFile pixel_BL2_tilt.csv }  <--- reference file of module coordinates here
  Layer 3 {
    radiusMode fixed
    placeRadiusHint 109
  }
}

Note: maxZ needs to be less than the Zcoord of the last module in the csv file. The csv file of module coordinates must have 7 columns and as many rows as modules in a rod. Each row has the coordinates of a double module, with columns Ycoord[mm] Zcoord[mm] Rotation[deg] Ycoord[mm] Zcoord[mm] Rotation[deg] Nrods. It looks like this:

68 0   0  70 0   0  24
68 70  10 70 70  10 24
68 140 20 70 140 20 24
68 210 30 70 210 30 24