to the fully cured stage as an alternative a specially formulated dicing tape can be used as adhesive tape 22 an example of suitable dicing tape is adwill d series tape provided by lintec corporation these tapes are comprised of a base material such as pvc poly vinyl chloride or pet polyethylene terephthalate or po polyolefin with an adhesive film that provides strong temporary adhesion alternately the adhesive could be provided on other base material such as polyimide the adhesive layer provided on the base layer is formulated so that it provides strong initial adhesion but upon exposure to uv ultraviolet radiation its adhesion is diminished and it can be peeled and released without causing damage or leaving residue on the copper traces 18 or the dielectric layer 12 in such case the backing must be transparent to uv radiation also it is to be understood that the tape 22 24 does not need to be a dielectric for example a metal foil with an adhesive on one side could be used this also constitutes a u201c tape u201d alternatively the adhesive bonding film material 30 could be a dry film epoxy adhesive which is b staged or other film type adhesive dielectric layers and used to laminate the core elements 10 a and 10 b together referring now to fig9 13 another embodiment of the present invention is shown which is useful in forming a joining member a substrate 10 is provided which is preferably an adhesive dielectric material for example this could be an adhesive coated film such as dupont pyralux lf which is a modified acrylic adhesive on a polyimide film or a.