You will need a slicker brush, stripping knife.
The top of the head is of major importance to the overall appearance as a majority of the points in the Standard" are on the head. If the top of the head isn't as flat as you would like it to appear, start by training the hair to lie flat. Spray the top of the head heavily with coat dressing, brush flat and allow it to dry naturally. This method may take some time, so be patient. If this method isn't doing the job for you, you may need to use the following as a last resort. Using a stripping knife, comb through the hair in the direction it grows. Do this gradually, taking a little out each time you groom. (Resist the urge to do this with thinning shears or scissors as this often makes the hair grow in denser.) Here again, try to picture the standard in your mind as your guide.