A method and technique of routing interconnects of an integrated circuit providing improved routing quality. The method comprises forming first, second and third lamination stacks by stacking individual rotor laminations together. The leading and trailing edges define a distance D therebetween, wherein each of the weights has a maximum lengthwise less than \xbd D. When the card is subsequently inserted in a card reader in order to be used by a user, the card reader reads the resultant pattern and compares the reading with the signals stored on the card or in the data base which is off the card to ascertain whether the card is valid. The invention is characterized in that the transfer tools are mounted so as to be uncoupled from one another in at least one degree of freedom. The cordierite particles may have a cordierite median particle size smaller than the surface median pore size.